Once a kobject is initialized, the containing object should not be
directly freed. So delay initialization until it is added. Also
remove the kobject_del call as the last put will remove the kobject as
well. The explicitly delete isn't needed here, and dropping it will
simplify further fixes.
With this md_free now does not need to check that ->gendisk is non-NULL
as it is always set by the time that kobject_init is called on
mddev->kobj.
Signed-off-by: Christoph Hellwig <hch@xxxxxx>
Reviewed-by: Logan Gunthorpe <logang@xxxxxxxxxxxx>
Reviewed-by: Hannes Reinecke <hare@xxxxxxx>
---
drivers/md/md.c | 10 ++++------
1 file changed, 4 insertions(+), 6 deletions(-)
diff --git a/drivers/md/md.c b/drivers/md/md.c
index b64de313838f2..7829045fc7fd9 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -678,7 +678,6 @@ static void md_safemode_timeout(struct timer_list *t);
void mddev_init(struct mddev *mddev)
{
- kobject_init(&mddev->kobj, &md_ktype);
mutex_init(&mddev->open_mutex);
mutex_init(&mddev->reconfig_mutex);
mutex_init(&mddev->bitmap_info.mutex);
@@ -5590,10 +5589,9 @@ static void md_free(struct kobject *ko)
if (mddev->sysfs_level)
sysfs_put(mddev->sysfs_level);
- if (mddev->gendisk) {
- del_gendisk(mddev->gendisk);
- blk_cleanup_disk(mddev->gendisk);
- }
+ del_gendisk(mddev->gendisk);
+ blk_cleanup_disk(mddev->gendisk);
+
percpu_ref_exit(&mddev->writes_pending);
bioset_exit(&mddev->bio_set);
@@ -5617,7 +5615,6 @@ static void mddev_delayed_delete(struct work_struct *ws)
{
struct mddev *mddev = container_of(ws, struct mddev, del_work);
- kobject_del(&mddev->kobj);
kobject_put(&mddev->kobj);
}
@@ -5719,6 +5716,7 @@ int md_alloc(dev_t dev, char *name)
if (error)
goto out_cleanup_disk;
+ kobject_init(&mddev->kobj, &md_ktype);
error = kobject_add(&mddev->kobj, &disk_to_dev(disk)->kobj, "%s", "md");
if (error)
goto out_del_gendisk;
--
2.30.2
